as radical gets. >>steve: have you seen this? the dramatic video of police closing in on dzhokhar tsarnaev? they used an infrared thermal imaging camera to pinpoint his exact location and movements inside the boat. >>brian: joining us with more on this technology taken from above, anna kooiman. >> good morning. they are stunning, these images. they were taken while taking tsarnaev into custody. you can see in the video released by the massachusetts state police, the 19-year-old in the boat, that image you see there is his body highlighted to thermal imaging. police were able to monitor his every movement because of this technology. now watch this. those big black puffs, those are explosions believed to be the flash grenades police threw at him. the company that makes the thermal cameras said the equipment worked exactly how it was supposed to. >> i think it was a real win they could look through the cover and see him lying inside the technology has been around for decades, but as you can see it keeps getting better and better. flare has more than 100 cameras in law enforcement communities.